Light was an ordinary high school student until one day when he stumbled upon an unassuming looking notebook. Inside the book, the front page read, "The person whose name is written in this book shall orgasm, in the manner proscribed and at the time written. If no manner or time are specified, the orgasm shall be spontaneous and occur exactly forty-five minutes from the time of writing."
Light didn't know what to make of it. A notebook claiming magical remote control over anyone's sex life as long as he wrote it down? It seemed like a sophomoric fantasy. But, to indulge his curiosity, he shrugged and wrote his own name, without any other modifiers. He carried on normally for exactly forty-five minutes until, out of nowhere a cataclysmic surge of pleasure erupted in his groin. Without any stimulus at all, he was blasting ropes of sticky cum into his pants.
He immediately realized the power of being able to put anyone in a sexual situation just by scribbling their name down. Exploring how far the powers of the Note could go, his mind raced, considering trying it on different people, places, times and manners of orgasm. For his first real test he would write the name of the most beautiful, popular girl in his class into the book, describing a detailed trist between himself and her in the pages. If it played out as written, he could do practically anything if he was just creative enough. And besides, he would lose his virginity to a pretty girl. He wrote her name down and waited. Sure enough, exactly on schedule she arrived, walked straight up to where he sat, leaned over and kissed him. She had never shown interest in him before, but the Coom Note forced her to act things out exactly as he had written. The knowledge that this girl, who had until a few moments ago been totally indifferent to him, was doing everything he wanted to the letter was an incredible rush, an even bigger thrill than the act itself. Every bit of this had been orchestrated by Light's pencil, a preordained fantasy of his made reality.
After they finished, Light fell back on the locker bench and panted as he gazed at the girl, who had fallen against the side of the lockers. Her face was flushed and she was still gasping from the intensity of the sex. Light looked at the stream of his cum dribbling out of her and wondered if he had made a huge mistake not wearing a condom. He had splattered DNA evidence everywhere. His fears subsided slightly as, once she had recovered her breath, she followed the instructions he had written, moving in a trance with a vacant dull expression straight to the showers where she was supposed to thoroughly wash away all evidence and then forget the escapade completely. Light grinned broadly as he walked home, confident in the knowledge that no one would ever know what happened between him and this innocent girl.
This was just the beginning. It would be a waste of this tremendous power to merely indulge his personal lusts. He could change the world, for the better.
He sat down in front of the TV, watching the beautiful celebrity women, and politicians, taking notice of their names. If he wrote them in the Notebook, it was certain they'd have some sort of sexual situation arranged. For example, he could write about an entire busload of naked women showing up at his house and doing whatever he wanted. The possibilities were endless.
No longer content to simply fulfill his passing fancies about the sexual situations he wanted to see play out, Light began writing scenarios involving the people in the news. He started with famous athletes and entertainers, using the Coom Note to force them into sexual situations. He was amazed at how easy the process was. Just think of something you want to happen, and the notebook will make sure that it does.
Light sat back and considered the possibility of using the Note to blackmail politicians, especially those who he felt had done wrong. It didn't take long to discover just how much power he really had. By writing down their names and describing detailed, compromising sexual situations they would have to endure, Light was able to turn anyone into an unwilling participant in whatever he wanted.
Light wrote a description of it into the notebook and waited. The results were amazing. He made his next target the Prime Minister of Japan, writing about him exposing himself on live TV. The man couldn't explain why he had done something so debauched and of course had to resign. With a stroke of his pen, Light had changed the course of the nation.
But he could not sit idly by and use the Note with impunity. The incident with the PM especially brought about a new special investigative unit whose aim was to understand the rash of high profile sexual incidents springing up across the country, all seemingly disconnected from one another, but happening so suddenly as to suggest some logical relation. Light paid special attention to the investigation, particularly the odd private detective brought onboard, known only as L, an alias, which made him immune to the Coom Note.